SnO2 homogeneous nanometer crystal nucleus shell structure coating and preparing method thereof

A core-shell structure and nanocrystal technology, applied in the field of electrochemistry, can solve the problems of high cost, inconsistent stress, short electrode life, etc., and achieve excellent crack resistance and structural stability, high fusion performance gradient characteristics, core The effect of high bonding force of the shell structure

Inactive Publication Date: 2019-09-06
杭州佳肯科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Early electrode coatings had Pt, but it was expensive, and platinum carbon electrodes were easily corroded and consumed during use.
At present, the coating material systems with high oxygen evolution overpotential widely studied include BDD, PbO 2 and SnO 2 , where Ti / BDD electrode has excellent electrochemical stability, but its production equipment is expensive, the process is complicated, and the cost remains high; Ti / PbO 2 The electrode has the risk of secondary pollution of water by Pb ions; SnO 2 The electrode of the system is relatively PbO 2 It has a higher oxygen evolution overpotential, but the biggest obstacle to its large-scale promotion in industry is that the electrode life is generally short. , the stress is inconsistent and cracks occur. During the electrolysis process, the oxidizing gas invades the Ti substrate through the gap, so that the Ti surface forms dense TiO 2 Thin film deactivates the electrode as a whole
[0007] Therefore, how to prepare highly dense SnO 2 Based electrocatalytic coating is the main research direction in the future. At present, most researches are focused on how to increase the density of the film layer by doping elements or adjusting the production process parameters, and how to adjust the film stress by changing the microstructure of the film itself to solve the problem. Cracking and electrode life problems caused by cold and hot cycle factors have not been reported

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  • SnO2 homogeneous nanometer crystal nucleus shell structure coating and preparing method thereof
  • SnO2 homogeneous nanometer crystal nucleus shell structure coating and preparing method thereof
  • SnO2 homogeneous nanometer crystal nucleus shell structure coating and preparing method thereof

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preparation example Construction

[0052] The invention provides a SnO 2 A catalytic electrode with a homogeneous nanocrystalline core structure and a preparation method thereof, comprising:

[0053] Preparation of crystal nucleus precursor liquid: SnCl x Add to the mixed solution of absolute ethanol and water, after hydrothermal reaction at 150-250°C under airtight conditions, add polyethylene glycol and stir to form a suspended crystal nucleus precursor liquid; wherein, the mixed solution contains absolute ethanol The weight ratio with water is 100:(0.1-1);

[0054] In this step, the suspended SnO is prepared by hydrothermal method 2 The crystal nucleus precursor solution plays the role of crystal nucleus adsorption and growth in the later sol-gel process; in this application, the ratio of water to absolute ethanol and the conditions of hydrothermal reaction are to ensure the formation of 40 - Key parameters of crystal nuclei with a size of 150nm;

[0055] During the experiment, after adding 0.1-1wt% wate...

Embodiment 1

[0066] A kind of SnO 2 A catalytic electrode with a homogeneous nanocrystalline core structure and a preparation method thereof, comprising:

[0067] Preparation of crystal nucleus precursor liquid: at 30°C, SnCl 2 2H 2 O, water, and absolute ethanol were mixed in a weight ratio of 5:0.1:100, stirred for 4 hours, placed in a hydrothermal reactor, kept at 150°C for 24 hours, cooled to room temperature naturally, and added to every 100 parts by weight of the solution 0.2 parts by weight of polyethylene glycol, stirred at 20°C for 4 hours to form a suspended crystal nucleus precursor liquid;

[0068] Preparation of sol: at 50°C, add 4 times the volume of absolute ethanol to the crystal nucleus precursor liquid to dilute, and dilute the SnCl 2 2H 2 O, SbCl 3 and Ni(NO 3 ) 2 ·6H 2 O is mixed according to the molar ratio of Sn:Sb:Ni of 100:3:0.1, and stirred for 3h; 2 : SnO 2 The molar ratio is 100:5, boiled and condensed at 85°C for reflux for 10 hours, and then aged at 4...

Embodiment 2

[0073] A kind of SnO 2 A catalytic electrode with a homogeneous nanocrystalline core structure and a preparation method thereof, comprising:

[0074] Preparation of crystal nucleus precursor liquid: at 45°C, SnCl 2 2H 2 O, water, and absolute ethanol were mixed in a weight ratio of 15:0.3:100, stirred for 3 hours, placed in a hydrothermal reaction kettle, kept at 200°C for 12 hours, cooled to room temperature naturally, and added to every 100 parts by weight of the solution 0.5 parts by weight of polyethylene glycol, stirred at 25°C for 3 hours to form a suspended crystal nucleus precursor liquid;

[0075] Preparation of sol: At 45 °C, add 7 times the volume of ethanol to the crystal nucleus precursor liquid to dilute, and dilute the SnCl 2 2H 2 O, SbCl 3 and Ni(NO 3 ) 2 ·6H 2 O is mixed according to the molar ratio of Sn:Sb:Ni of 100:5:0.3, and stirred for 3h; 2 : SnO 2 The molar ratio was 100:10, boiled and condensed at 90°C for reflux for 5 hours, and then aged at...

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Abstract

The invention discloses a preparing method of an SnO2 homogeneous nanometer crystal nucleus shell structure coating. The method comprises the steps of firstly, hydrolyzing tin salt in absolute ethyl alcohol containing 0.1-1 wt% of water, adopting a hydrothermal reaction method for forming a crystal nucleus precursor with a suitable size, and then forming the antimony-nickel-codoped SnO2 coating through a sol-gel method. By means of the preparing method, a titanium substrate or other insulators can be coated with up to 50 layers of thick films in sequence while fracturing phenomena hardly occurfundamentally. The obtained coating has high photoelectric performance, the degradation efficiency of electrodes can be effectively improved, and the service life of the electrodes can be effectivelyprolonged.

Description

technical field [0001] The invention relates to the field of electrochemical technology, in particular to a SnO 2 Homogeneous nanocrystalline core-shell structure coating and preparation method thereof. Background technique [0002] With the rapid development of society, organic pollution has become a global and extremely serious problem. Organic pollutants involve a wide range of fields, including not only industry (printing and dyeing, pharmaceuticals, chemicals), agriculture, and animal husbandry, but also municipal environmental protection, such as garbage disposal, municipal water treatment, and river water treatment. [0003] The composition of organic pollutants is very complex. People have also developed and developed various water treatment technologies for different wastewater, such as biological methods, membrane technologies, adsorption methods, precipitation methods, incineration methods, etc., but the most commonly used method is still biological decomposition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/843C02F1/461C02F101/30
CPCB01J23/8435B01J35/0033C02F1/46109C02F2101/308C02F2001/46142
Inventor 彭春佳蔡永秀
Owner 杭州佳肯科技有限公司
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